Quality of service challenges

The paper discusses two different approaches to the quality of service assessment in circuitand packet-switched networks. It shows the fundamental differences between these environments, traffic characteristics and their impact on key performance indicators. The author presents an example of quality evaluation in legacy and modern networks. He also highlights the multi-service character of current packet networks and underlines the need for diverse quality measures to describe individual services. The heterogeneous character of the Next Generation Networks determines new challenges in the area of quality assessment, which is also addressed here. The paper introduces the special session on Service Quality (ServQual), which is included in the Ninth International Conferences on Advanced Service Computing – Service Computation 2017, held in Athens, Greece. KeywordsQoS; QoE; benchmarking measurements, quality model, customer experience.